cc: Add UMA for tracking decode duration for out of raster decodes.

cc/tiles/image_controller.h

Index: cc/tiles/image_controller.h
diff --git a/cc/tiles/image_controller.h b/cc/tiles/image_controller.h
index 30e93f68b182240c9a6ca93d4718180f279d4741..7fb8c821fe6a1e0bb764447c3bcef26dfe136b59 100644
--- a/cc/tiles/image_controller.h
+++ b/cc/tiles/image_controller.h
@@ -56,7 +56,8 @@ class CC_EXPORT ImageController {
   // Virtual for testing.
   virtual ImageDecodeRequestId QueueImageDecode(
       sk_sp<const SkImage> image,
-      const ImageDecodedCallback& callback);
+      const ImageDecodedCallback& callback,
+      ImageDecodeCache::ImageDecodeType type);
   size_t image_cache_max_limit_bytes() const {
     return image_cache_max_limit_bytes_;
   }
@@ -75,7 +76,8 @@ class CC_EXPORT ImageController {
                        const DrawImage& draw_image,
                        const ImageDecodedCallback& callback,
                        scoped_refptr<TileTask> task,
-                       bool need_unref);
+                       bool need_unref,
+                       ImageDecodeCache::ImageDecodeType decode_type);
     ImageDecodeRequest(ImageDecodeRequest&& other);
     ImageDecodeRequest(const ImageDecodeRequest& other);
     ~ImageDecodeRequest();
@@ -88,6 +90,7 @@ class CC_EXPORT ImageController {
     ImageDecodedCallback callback;
     scoped_refptr<TileTask> task;
     bool need_unref;
+    ImageDecodeCache::ImageDecodeType decode_type;
   };
 
   void StopWorkerTasks();